Individual study: Bullfrogs: introduced predators in southwestern wetlands
Rosen P.C. & Schwalbe C.R. (1995) Bullfrogs: introduced predators in southwestern wetlands. Pages 452-454 in: E.T. LaRoe, G.S. Farris & C.E. Puckett (eds.) Our living resources: a report to the nation on the distribution, abundance, and health of US plants, animals, and ecosystems. U.S. Department of the Interior, Wasington D.C., USA.
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